$\lim_{x\to0}\left(\frac{\sin\left(x^2\right)}{\cos\left(3x\right)}\right)$
$\int\frac{\cot^2\left(t\right)}{\csc\left(t\right)}dt$
$\int_0^{20}\left(180+3x\right)dx$
$\int3\left(1-x^2\right)dx$
$12b^6+6^3-18^2$
$8x^2\:-\:128$
$\int\left(x^3\sqrt{x^4+1\:}\right)dx$
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